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Core Maths 4: Differentiation...another not getting the same answer as the book

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    Hi there

    Please could you tell me who is correct, many thanks;


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    The book is correct

    Look after you equation where you multiplied by -1/3
    -\frac{1}{3}\cdot (-\frac{3}{\sqrt{2}})=\frac{1}{ \sqrt{2}}
    Moreover
    \frac{1}{\sqrt{2}}+\frac{1}{\sqr  t{2}}=\sqrt{2}
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    Book's right for the tangent, as ztibor says.

    And you're right for the normal.
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    and thank you I understand that now, what about the second question?
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    Did you see my previous post?
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    ok thank you

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